arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0912.3828astro-ph.HE
收藏

用费米大天区望远镜间接寻找Milky Way中心的暗物质

Indirect Search for Dark Matter from the center of the Milky Way with the Fermi-Large Area Telescope

Vincenzo Vitale, Aldo Morselli

摘要:

银河系中心区域预计将拥有银河系内最大密度的暗物质(DM)粒子。然后,从可能的DM粒子湮灭(或衰变)中可以预期相对较大的伽马射线信号。我们正在寻找来自银河系中心的DM伽马射线信号,该信号也富含明亮的离散伽马射线源。此外,由于宇宙射线与星际气体和辐射的相互作用,从同一方向探测到强烈的弥散伽马射线发射。初步分析的数据,在第一个11个月的费米卫星操作,报告。正如我们今天所知道的那样,弥漫的伽马射线背景和离散源可以解释银河系中心探测到的大部分伽马射线发射。尽管如此,仍留下了上述模型未考虑的残余排放量。改进的银河漫发射模型和对新的(可能未解决的)源(或源群)的仔细评估将提高DM搜索的灵敏度。

英文摘要:

The Galactic Center region is expected to host the largest density of Dark Matter (DM) particles within the Milky Way. Then a relatively large gamma-ray signal would be expected from the possible DM particles annihilation (or decay). We are searching for the DM gamma-ray signal from the Galactic Center, which is also rich in bright discrete gamma-ray sources. Furthermore intense diffuse gamma-ray emission due to cosmic-ray interactions with interstellar gas and radiation is detected from the same direction. A preliminary analysis of the data, taken during the first 11 months of the Fermi satellite operations, is reported. The diffuse gamma-ray backgrounds and discrete sources, as we know them today, can account for the large majority of the detected gamma-ray emission from the Galactic Center. Nevertheless a residual emission is left, not accounted for by the above models. An improved model of the Galactic diffuse emission and a careful evaluation of new (possibly unresolved) sources (or source populations) will improve the sensitivity for a DM search.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑